Light-emitting device with enlarged area of active luminescence region

• US 20050156177A1
• Filed: 05/11/2004
• Published: 07/21/2005
• Est. Priority Date: 01/20/2004
• Status: Abandoned Application

• Current Assignee: Opto Tech Corporation (OptoTech Corp.)
• Original Assignee: Opto Tech Corporation (OptoTech Corp.)
• Inventors: Lin, San Bao, Lin, Ming-Der, Hsu, Jung-Kuei
• Application Number:
  US10/842,507
• Publication Number:
  US 20050156177A1
• Time in Patent Office: Days
• US Class Current: 257/79
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/38 with a particular shape

Abstract

A light-emitting device is provided, having an enlarged area of active luminescence region to enhance the brightness, mainly comprising a second epitaxy layer and at least one first epitaxy layer provided on a die substrate in turn. On the top surface of the first epitaxy layer, there are provided with at least one first electrode, and a plurality of second electrodes passing through the first epitaxy layer, insulated with the first epitaxy layer by means of an electrode insulation layer, and electrically connected to the second epitaxy layer, in which the first electrode and the second electrodes are alternately arranged. Moreover, first power supply circuits and second power supply circuits are provided on a power supply substrate at positions based on the locations of the first electrode and second electrodes so as to be adhesively electrically connected to the first electrode and the second electrodes, correspondingly. The plurality of first power supply circuits is connectedly provided with a first connective circuit, and the second power supply circuits are connectedly provided with a second connective circuit. The first connective circuit and second connective circuit are provided on the power supply substrate, instead of provided on the light-emitting device directly. Thus, the area of active luminescence region is relatively enlarged, whereby the luminous yield is enhanced accordingly.

Claims

1. A light-emitting device with enlarged area of active luminescence region, comprising:

at least one light-emitting die, each including a die substrate provided with a second epitaxy layer defining at least one first surface and at least one second surface, said first surface further formed with a first epitaxy layer thereon, an active luminescence region naturally formed between said first epitaxy layer and said second epitaxy layer, a part of surface of said first epitaxy layer provided with at least one first electrode, while a part of surface of said second epitaxy layer provided with at least one second electrode; and

a power supply substrate provided with, on the surface thereof, at least one first power supply circuit and at least one second power supply circuit at positions corresponding to said first electrode and said second electrode, respectively, each of said first power supply circuits electrically connected to another via a first connective circuit, while each of said second power supply circuits connected to another via a second connective circuit, said first power supply circuit electrically interconnected with said corresponding first electrode, while said second power supply circuit electrically interconnected with said corresponding second electrode.

2. The light-emitting device according to claim 1, wherein said power supply substrate is a surface insulation substrate.

3. The light-emitting device according to claim 2, wherein said power supply substrate is made from what selected from the group consisting of Si₃N₄, AIN, SiC, GaN, and the combination thereof.

4. The light-emitting device according to claim 1, wherein said light-emitting diode die is presented as a flip-chip package so as to be inverted and then adhered to said power supply substrate.

5. The light-emitting device according to claim 1, further comprising an electrostatic discharge protection device fixedly provided on said power supply substrate and electrically connected to said first connective circuit and said second power supply circuit, respectively.

6. The light-emitting device according to claim 5, wherein said electrostatic discharge protection device is selected from either Zener diode or Schottky diode.

7. The light-emitting device according to claim 1, further comprising an electrostatic discharge protection device fixedly provided on said power supply substrate and electrically connected to said second connective circuit and said first power supply circuit, respectively.

8. The light-emitting device according to claim 1, wherein said die substrate is made from what selected from the group consisting of SiC, GaN, sapphire, GaAs, and the combination thereof.

9. The light-emitting device according to claim 1, wherein said plurality of second electrodes are presented as what selected from linear arrangement, annular arrangement, staggered arrangement, and the combination thereof.

10. The light-emitting device according to claim 1, wherein said second electrode is provided with an electrode insulation layer at sides thereof.

11. The light-emitting device according to claim 1, wherein the location of said second surface is lower than that of said first surface in said second epitaxy layer.

12. The light-emitting device according to claim 1, wherein said first connective circuit is provided with at least one first bonding pad thereon, while said second connective circuit is provided with at least one second bonding pad thereon.

13. The light-emitting device according to claim 1, wherein a bonding layer is further provided between said first electrode and said first power supply circuit, as well as between said second electrode and said second power supply circuit.